Roberts Gorden CRV-B-2 Manual Do Utilizador

19

Table 5 for the burner model to ensure that the result-
ing tailpipe lengths maintain intended operating char-
acteristic.

Damper couplings are needed:

• In any tailpipe branch that carries less flow units 

than other tailpipe branches connected to the 
same pump

• In unsymmetrical layouts with branches having 

the same number of flow units, the damper cou-
pling is placed in every branch except for the 
longest branch.

The purpose of the damper coupling is to adjust the 
end vent vacuum down to the desired level. These are 
to be placed in the tailpipe section and not the radiant 
branch. The recommended location is before the first 
tee fitting or 10'-40' from the end of the radiant pipe. 
See Page 20, Figure 17; Page 23, Figure 21, Page 
24, Figure 25, and Page 25, Figure 26 for placement 
examples.